Officers said Cade Poulos, 13, shot himself at about 7:50 a.m. Wednesday at Stillwater Junior High, located at 1900 North Skyline St. No other students were injured or threatened, police said.

Students told KOCO Eyewitness News 5 that it was a teacher who ran to Poulos' side as soon as the self-inflicted shooting happened. At that point, the school was locked down and students were evacuated to Cimarron Plaza, a shopping center, at 1529 Cimarron Plaza.

Parents were notified via a district messaging system and were asked to pick up their students there.

It was superhero dress-up day at school, according to the school's website. Students who spoke with KOCO Eyewitness News 5's Dan Thomas said the student who died was an eighth-grader and that he'd dressed up as Two-Face from the Batman series.

News conference held at 11:30 a.m.When asked whether Poulos had been bullied, Stillwater superintendent Ann Caine said the district had no records indicating such. However, police department spokesman Randy Dickerson said the investigation is just beginning.

Caine described Poulos as a good student with bright red hair and a big smile.

Dickerson said the school's evacuation plan worked as it should. Dickerson added that Stillwater has been very fortunate that incidents like Wednesday's are very isolated in their community.

All Stillwater schools, except the junior high, will have a regularly scheduled school day.

Stillwater Junior High does not have metal detectors. However, Caine said district officials would discuss the possibility of installing them.